二次函数
(a,b,c为常数,且
),函数y与自变量x的部分对应值如下表:
下列结论:①
;②二次函数的图像与x轴总有两个公共点;③若
,则二次函数图像顶点的纵坐标的最小值为3;④当自变量x的值满足
时,与其对应的函数值y随x的增大而增大,则
,其中所有正确结论的序号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![]() | … | ![]() | 1 | … |
![]() | … | ![]() | 3 | … |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ac9eb4f13a6ec140f7050e8d7dde52c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6343069217cd6d8dd32446da428dae46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c8b1fb778919b87191a1e17a03bac4d.png)
A.①②③ | B.②③④ | C.①②④ | D.①③④ |
22-23九年级上·江苏南京·期末 查看更多[2]
更新时间:2023-03-09 12:44:10
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【推荐1】如图是抛物线
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【推荐2】如图,在
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